2019: On Halloween, student Harper (Katie Stevens) and her friends come across a haunted house that reminds them that some nightmares are true. To make such an eerie discovery on the scariest day of the year is like an invitation for the group to get involved in this house. So everyone at the entrance hands in their cell phones and the fun can start. The first “creepy” attractions can not impress the youngsters, but soon they will be better informed. At the next station, a girl is cruelly tortured – or not? The friends are not in agreement whether here rather convincing actors are at work. The deeper they move into the house, the more they realize that they can not escape the haunting. Hoping to find a way out someday, they have no choice but to continue on the murderous experiment. How many of them can escape the deadly spaces?